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Re: weird ro mapping generate by ld-linux.so

From: Andreas Schwab <schwab at redhat dot com>
To: Mathieu Lacage <mathieu dot lacage at gmail dot com>
Cc: libc-help at sourceware dot org
Date: Fri, 17 Sep 2010 10:54:19 +0200
Subject: Re: weird ro mapping generate by ld-linux.so
References: <AANLkTikUxbanQWYjy-2+Q8_QZa_+SH-pYg=jzWQL4Hg2@mail.gmail.com><m3k4mnchjw.fsf@hase.home><AANLkTiki8Per-ZusW4Bn=DSw0jGdr-Hr+Oeg7EObGtQE@mail.gmail.com>

Mathieu Lacage <mathieu.lacage@gmail.com> writes:

> I wonder why the linker does not simply generate 3 PT_LOAD entries
> (RO, RO, RW) to do this instead of generating only two (RO,RW).

Because the relro segment must be relocated, so it cannot be made ro at
first (without reverting to the much more expensive TEXTREL).  Loaders
that don't know about relro can just ignore it and do the right thing
(by keeping it rw).

Andreas.

-- 
Andreas Schwab, schwab@redhat.com
GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84  5EC7 45C6 250E 6F00 984E
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References:
- weird ro mapping generate by ld-linux.so
  - From: Mathieu Lacage
- Re: weird ro mapping generate by ld-linux.so
  - From: Andreas Schwab
- Re: weird ro mapping generate by ld-linux.so
  - From: Mathieu Lacage

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